Common Murre, also known as the Common Guillemot or Murre

The Common Murre is a large auk resembling a penguin in posture, sporting dark brown to black head, back, and upperparts with crisp white underparts. They are exceptional diving birds that "fly" underwater using their wings to pursue fish. During breeding, they gather by the hundreds of thousands on narrow rocky cliff ledges.

Striking monochromatic coloration with a glossy, dark brownish-black tip and upper vane, sharply contrasting with a clean white base and lower plumulaceous section

Pennaceous upper portion with tightly interlocked barbs and barbules, transitioning to a plumulaceous (fluffy, downy) structure near the base with loose barbs lacking strong hooklets

Central rachis is sturdy yet flexible, dark brown to black in the pigmented upper section and fading to white at the calamus; barbs are densely packed at a narrow angle to create a smooth, water-resistant surface

Smooth, sleek, and tightly knit along the pennaceous portion with a subtle glossy sheen, contrasting with the soft, fluffy texture at the base

Upper back, mantle, or scapular region; determined by the stiff, sleek dark upper vane that transitions into a flexible, downy base designed for thermal insulation against cold ocean water

Distinctive sharp color split between the glossy dark brown/black upper vane and the bright white fluffy base, characteristic of upper-body contour feathers in pelagic alcids

Marine pelagic environments, coastal waters, rocky cliffs, and islands during the breeding season

Circumpolar distribution in cold northern waters of the Atlantic and Pacific oceans, breeding on coastal cliffs and wintering at sea

Vital marine apex predators and forage fish consumers, serving as important ecological indicators of ocean health and prey availability in northern marine ecosystems

Other alcids such as Thick-billed Murres (Uria lomvia) and Razorbills (Alca torda), which share similar black-and-white coloration but vary slightly in feather dimensions and structural details

Common Murres lay uniquely pear-shaped (pyriform) eggs. The pointed shape prevents the egg from rolling off narrow cliff ledges, causing it to spin in a tight circle instead if disturbed.

Historically, murre eggs and feathers were heavily harvested by coastal human communities and eggers, leading to significant population declines in the 19th century before protective regulations were enacted

Look near rocky marine breeding colonies, coastal tidelines, or beach-cast debris where seabird molts wash ashore; often found alongside gull and cormorant feathers

Good condition with intact barbs along the pennaceous section and slight fraying at the fluffy base; clean with no obvious parasitic damage or heavy wear